package com.tanhua.sso.service;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.tanhua.sso.config.HuanXinConfig;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.time.Duration;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Service
public class HuanXinTokenService {

    @Autowired
    private HuanXinConfig huanXinConfig;

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private RedisTemplate<String,String> redisTemplate;


    public static final String REDIS_KEY="HUANXIN_TOKEN";

    private static final ObjectMapper MAPPER = new ObjectMapper();

    public String getToken(){

        String cacheData = this.redisTemplate.opsForValue().get(REDIS_KEY);
        if(StringUtils.isNotEmpty(cacheData)){
            return cacheData;
        }

        String targetUrl = this.huanXinConfig.getUrl()+this.huanXinConfig.getOrgName()+"/"+this.huanXinConfig.getAppName()+"/token";

        Map<String,String> param = new HashMap<>();
        param.put("grant_type","client_credentials");
        param.put("client_id",this.huanXinConfig.getClientId());
        param.put("client_secret",this.huanXinConfig.getClientSecret());

        ResponseEntity<String> responseEntity = this.restTemplate.postForEntity(targetUrl, param, String.class);

        if(responseEntity.getStatusCodeValue()!=200){
            return null;
        }

        String body = responseEntity.getBody();

        try {
            JsonNode jsonNode = MAPPER.readTree(body);
            String accessToken = jsonNode.get("access_token").asText();
            //过期时间，提前一天失效
            long expiresIn = jsonNode.get("expires_in").asLong() - 86400;
            if (StringUtils.isNotBlank(accessToken)) {
                //将token保存到redis，有效期为5天，环信接口返回的有效期为6天
                this.redisTemplate.opsForValue().set(REDIS_KEY, accessToken, expiresIn, TimeUnit.SECONDS);
                return accessToken;
            }
        }catch(Exception ex){
            ex.printStackTrace();
        }
        return null;


    }




}
